Get a Error Code with Python Script.

The code below Download error code reference from NewLC and stores the error code reference to a c:/temp folder. Forgetting error meaning just pass error code as argument like below.

python geterr -11

The Script is as below

import urllib
import re
import os
import pickle
import sys

temp = "c:\\temp\\"
picklefilename = os.path.join(temp, "kerr_lookupdata.txt")
try:
  os.mkdir(temp)
except:
  pass

# common variables

def extractErrorInfo(matchstr):

  rawstr = r"""<tr class="\D*"><td>\s*<strong class="\D*">(.*)</strong>\s*</td>\s*<td>\s*(.*)\s*</td>\s*<td>\s*<i class="spip">(.*)</i>\s*</td>\s*</tr>"""
  rawstr2 = r"""<tr class="\D*"><td>\s*<strong class="\D*">(.*)</strong>\s*</td>\s*<td>\s*(.*)\s*</td><td>\s*.*"""
  rawstr3 = r"""<td>\s*(\w*)\s*</td>.*<td>\s*([-0-9]*)\s*</td>"""

 # method 1: using a compile object
  compile_obj = re.compile(rawstr)
  match_obj = compile_obj.search(matchstr)

  if(match_obj == None):
      compile_obj2 = re.compile(rawstr2)
      match_obj = compile_obj2.search(matchstr)

  if(match_obj == None):
      compile_obj3 = re.compile(rawstr3)
      match_obj = compile_obj3.search(matchstr)

  if(match_obj):     
      # Retrieve group(s) from match_obj
      all_groups = match_obj.groups()

      # Retrieve group(s) by index
      group_1 = match_obj.group(1)
      group_2 = match_obj.group(2)
      try:
          poo = group_3 = match_obj.group(3)
      except IndexError:
          return (group_1.strip(), group_2.strip(), "")
      else:
          return (group_1.strip(), group_2.strip(), group_3.strip())
  else:
      return None

def extractcodes(line):
  fields = extractErrorInfo(line)
  if(fields):
      params = list(extractErrorInfo(line))
      params[1] = params[1].replace("--","-")
      params[0] = params[0].replace("\"","")
      params[0] = params[0].replace("\'","")
      params[0] = params[0].replace("\\","")
      params[2] = params[2].replace("\"","")
      params[2] = params[2].replace("\'","")
      params[2] = params[2].replace("\\","")

      try:
          params[1] = int(params[1])
      except ValueError:
          return None
      return params
  return None


def test():
  tcs = ["""<tr class="row_even"><td> <strong class="spip">KErrNotFound</strong> </td><td>-1</td><td><i class="spip">Unable to find the specified object</i></td></tr>""",
  """<tr class="row_odd"><td><strong class="spip">KErrEtelNotCallOwner</strong> </td><td>-2000</td><td> </td></tr>""",
  """<tr class="row_even"><td> KErrAvctpBadAddress</td><td> -6400 </td><td><i class="spip">AVCTP bad address </i> </td></tr>""",
  """<tr class="row_even"><td> KErrAvctpBadAddress</td><td> --6400 </td><td><i class="spip">AVCTP bad address </i> </td></tr>""",
  """<tr class="row_even"><td> KErrAvctpBadAddress</td><td> MOO </td><td><i class="spip">AVCTP bad address </i> </td></tr>"""]

  for testcase in tcs:         
      print extractcodes(testcase)

def regenerateErrorFile():
  file = urllib.urlopen("http://newlc.com/Symbian-OS-Error-Codes.html")
  lines = file.readlines()

  lookupcode = -5
  look_up = {}

  for line in lines:
     fields = extractcodes(line)
     if(fields):
         look_up[fields[1]]= (fields[0],fields[2])
      
  output = open(picklefilename,"wb")
  pickle.dump(look_up, output)
  return look_up

#test()

try:
  pkl_file = open(picklefilename, 'rb')
  lookup = pickle.load(pkl_file)
  pkl_file.close()
except IOError:
  print "Re-Generating file"
  lookup = regenerateErrorFile()



args = sys.argv
if(len(args)!=2):
  print "Usage kerr <errorcode>"
  print "e.g kerr -1"
  sys.exit()

try:                          
  errtupe = lookup[int(args[1])]
  print "%s [%s]"% errtupe
except:
  print "Unknown error"